The rain forests of South America are very active photosynthetic zones. Although plants around the world use photosynthesis, these areas are more productive than other parts of the planet.

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Explanation:

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the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.